APPARATUS (Sheave) FOR GUIDING CABLE IN AND OUT OF MANHOLES AND CONDUITS

ABSTRACT

Apparatus (sheave) is for guiding cables from a single pulling location through conduit that extends continuously between manholes and end points of conduit runs. The cable is set up at one end of the conduit run and a power driven tugger is set up at the other end of the cable pull. The invention apparatus (sheave) is installed at each end of the run to guide the cables into the conduit through the manhole or out conduit stub. A rope is installed through the invention apparatus (sheave) and into the conduit and then through another invention apparatus (sheave) at the other end and then connected to the cable. A power driven tugger is energized which cause tension on the rope and cable and pulls the cable through the invention apparatus (sheave) end.

BACKGROUND OF INVENTION

This invention relates to the placement of cable in conduits for thepurpose of uniformly bending the conductors/cable as it enters and exitsmanholes and conduits.

An object of this invention is to provide conductors/cables guidingmeans that is adjustable to accommodate for different arrangements ofmanholes relative to the position of the conduits and how and where theconduits turn up and to maintain the manufactures bending radius andprotection of the conductors/cable entering and exiting the manhole andconduit.

This unit when used at manholes gives the ability to be installedwithout anchoring sheaves inside of the manholes and be able toinstalled over top of existing cables in the manholes without having toinstall sheave through existing conductors/cable.

Another object of this invention is using the top section to provideconductors/cable guiding means to enter and exit conduits that areturned up without installing sheaves on building structures and havingto use cranes to hang a sheave off of.

Another object of this invention is using the bottom section to provideconductors/cable guiding means to go around horizontal or vertical 90degree bends.

FIG. 1 shows the unit installed in a manhole similar installation wouldbe at the other end of the cable run.

FIG. 2 shows the top portion of the unit install over a conduit stubbedup. This installation eliminates the need to secure sheaves off thebuilding structure, poles or off a crane.

FIG. 3 shows the bottom portion of the unit installed horizontally inpart of the cable pull.

INSTALLATION METHOD

The 2 parts are bolted together (8) and (9) with ⅝ square bolts and nuts(10) and the appropriate sheave roller (6″ or 12″) (11) are installedusing bars (28) and securing pins (12) in ⅞″ hole that are reinforced.The unit is installed in a working manhole/chamber (1) through themanhole access opening (2) and is adjusted to the depth of the conduits(3) entering the manhole/chamber (1) at both ends of the cable run.

The bottom unit (9) can be installed 180 degrees from what is shown inFIG. 1 to make a C shape.If the cable does not exit a manhole or does not exit a stubbed upconduit a second unit is not required.The unit is anchored to the side of the manhole access opening andanchored above grade on concrete using ½″ drop in anchors, bolts andwashers. 2—1½″ steel square tubes( 15) are installed through thesupporting square tubes (5) which goes over the opening of the manholeaccess hole. 4 —¾″ J-hooks (21) (2 in each square tubing (15)) areinstalled through the square tubing and secured to the underside of themanhole opening lip or the ceiling of the manhole.For additional tension capability and stability of the unit anadjustable support (22) is installed on top of the foot of the unit andadjusted to the height so that it is installed to the underside of themanhole ceiling. When the adjustable support (22) is moved into place aspring loaded latch (27) which locks the unit into place. To releasethis support a cable runs down the side of the unit and up to the top ofthe manhole when pulled it release the spring loaded latch (27) and thesupport (22) can be tilted out of the way. The adjustment of the supportis done by inserting a ⅜″ U bar (29) and a threaded rod (24) which has awing nut (23) is adjusted to set the final height.An octagon roller unit( 30) is installed by bolting it with ½″ carriagebolts on the end of the foot of the leg (9) which guides the cable ifthe conduit is slightly off centre of the roller at the foot of the unit(9).Other methods of securing the unit is by installing slings(25) over thefoot/leg of the unit (9). Anchoring points for the slings would be inthe side wall or floor of the manhole/chamber by using 3″ angle iron(26) with holes to secure the slings to.

The rope (13) is woven through the unit and attached to the tugger orpulling apparatus and at the conductors/cable real end theconductors/cable (14) is woven through the unit. Installation of thecable can commence.

For removing of the cable from the unit, the bars and securing pins (12)and sheave rollers (11) can be removed in order to remove theconductors/cable.

Reinstallation of the sheave rollers( 11), bars (28) and securing pins(12) and readjusting the unit for the next conductors/cable pull.

On completion of the conductors/cable installation the unit is removedfrom the chamber and manhole access hole by removing the 1 ½″ squaretubing (15) and Jhooks (21) and removing the octagon roller unit (30).

FIG. 2. For installation of unit (8) over a stubbed up conduit (31),legs (18 and 17) are installed on the above mentioned unit (8) andsecured to the floor using ½″ drop-in anchors, bolts and washers (19)into the concrete floor and ½ bolts and nuts bolting the unit (8) to theleg(17).

The conductors/cable and rope are placed on top of the unit in orderedto be guided into the conduit and out of the conduit to the pullingapparatus.

FIG. 3. For installation of the unit(9), 3 —yoke hooks (18) areinstalled over all three sheave rollers. Rods (28) and securing pins(12) are replaced with longer rods to secure the yoke hooks.

Chain and/or slings are secured to structures in order to align the unit(9) in the appropriate alignment (for a 90 degree bend) for theconductors/cable to turn direction.

I claim:
 1. The system provides the placement of conductors/cable inconduits by uniformly bending the conductors/cable as they enter andexit the conduit and manhole.
 2. The system of claim 1 is made up of twocomponents. Each component can be used individually or together to makea sheave ideal for working in manholes and with conduit stubs.
 3. Thesystem of claim 1 comprises of six rollers installed between twosections of support plates that allow interchanging of the rollers todifferent size by removing the pin that holds the roller and replacingwith a different size.
 4. The system of claim 1 is an adjustable unit toaccommodate for different arrangements of conduits and depth of manhole.5. The system of claim 1 can be used a two separate units. 1) Topsection of said unit of claim 1 is installed on a stand and placed overa stubbed up conduit in order to guide conductors/cable in and out ofthe conduit. 2) Bottom section of said unit of claim 1 providesconductors/cable guiding mean to go around horizontal o vertical ninetydegree bends.